Using hands, combine lamb, onion, garlic, egg and breadcrumbs in medium bowl. Season. Shape lamb mixture into eight patties.,Heat oil in large skillet on medium-high heat. Cook patties for about 15 mins or until browned on both sides and cooked through. Drain on paper towels; cover with foil to keep warm. Reserve pan with drippings.,Meanwhile, boil, steam or microwave potatoes until tender; drain. Crush potatoes in medium bowl by smashing them a few times with potato masher; stir in butter. Season.,______,Meanwhile, cook tomatoes, stirring, in heated small skillet about 2 mins or until split and just softened.,Divide potato among serving plates. Top with patties, rosemary gravy and tomatoes.